imortal wrote:
Scorpion0x17 wrote:
I may be wrong, and I hope to god I am, but that will not stop me asking questions.
Only a closed mind stops asking questions.
Anyone may ask a question. Those with a closed mind will simply not accept the answer they are given.
I noticed early on, when you were doing your 'logic test,' that every single item ha the phase "all collapsed in on themselves as if brought down by controlled explosions."
In your opinion, what are the characteristics of a controlled demolition? For that matter, how would you consider a building NOT being brought down by a controlled demolition to act? Are you comparing it to buildings knocked down by earthquakes, or what?
All buildings, by their very nature, are more are more space inside than material. That is critical if we are to have a useable building. Second, there is always a force acting upon a building; gravity. Gravity wants to pull everything to the ground, and all that keeps the building up are it supports. If a support fails, the weight it was meant to support has to be spread to another support, or else that area will collapse; if the nearby supports can not cover for the loss of the first support, then they too will collapse. Main supports are very specialized in the stresses they can handle; they are really good at holding weight up, but not very good at all at being tilted or taking lateral stress. If part of the weight for a support is gone, and the load it is supporting is off balance, it puts an unusual strain on the support that it is not designed to handle, and that support may fail, which is why tall buildings will not tip over like a person falling back.
If a lateral force is imparted on a building, like the top part of building 1, then you have several forces going on at once. say half of the supports give way, due to fire and impact damage. The mass those supports held up start to fall. More and more supports fail as they are suddenly asked to support more and more loads they were not designed for. At the same time, the supports on the far end are still holding up their side of teh building. What you end up having is the top of the building starting to tip, or fold. The hinge, or pivot point, are those supports that are still intact. Those supports are not designed to put up with the stresses being imparted on them now, so they fail. Now the upper part of the building falls. Without a pivot force or hinge, the upper part of the building loses its imputus for lateral movement; it still has the sideways motion that was imparted early in the fall, but no more is added and now gravity is inserting its own ideas. However, the debris did maintain enough lateral energy to make it as far as WTC 7 by the time it hit the ground.
The majority of the upper portion simply fell down. Below the break, we do not know if the fire or blast reached them, but as the upper floors crashed down, the load redistributed in ways impossible to for engineers to predict or plan the supports to handle, so they start to fail. The more than fail, the faster the rest fail. But there is no other sideways force that is acting on the building now, just gravity. And gravity only acts in one way; down.
A controlled demolition works with just gravity. But controlled demolitions (also called 'imploding,' since the resulting debris from the building occupies less volume than the building originally did- no people spaces left) cheat by purposely and with foresight using explosives to cut supports and cross beams, and degrading the ability of the main supports to handle the weights they are meant to. They then let gravity do all the work for them.
There is more I could write, but the more I type, the less anyone is likely to actually read it, and my wife is in bed impatiently waiting for me.
